[libvirt-users] [libvirt] libvirtError: this function is not supported by the connection driver: virInterfaceDefineXML

[Michal Privoznik]

On 12.03.2014 14:41, Sijo Jose wrote:
>
>
>
> Hi,
> Could anyone help I'm getting the following error when I tried to add a
> new network interface.
>
> DETAILS
>
>
> Connection
> ---------------------------
> import libvirt
> conn = libvirt.open('qemu:///system')
>
> Interface XML
> ----------------------
>
> <interface type="bridge" name="br0">
>    <start mode="onboot"/>
>    <mtu size="1500"/>
>    <protocol family="ipv4">
>      <dhcp/>
>    </protocol>
>    <bridge stp="off" delay="0.01">
>      <interface type="ethernet" name="eth0">
>        <mac address="ab:bb:cc:dd:ee:ff"/>
>      </interface>
>      <interface type="ethernet" name="eth1"/>
>    </bridge>
> </interface>
>
>
>
>
>
> In [96]:
>
> conn.interfaceDefineXML(interfacexml,0)
>
> ---------------------------------------------------------------------------
> libvirtError                               Traceback (most recent call last)
> /home/saju/<ipython-input-96-0536ffe3fa23>  in<module>()
> ----> 1  conn.interfaceDefineXML(br1xml,0)
>
> /usr/lib/python2.7/dist-packages/libvirt.pyc  ininterfaceDefineXML(self, xml, flags)
>     2750          libvirtd. """
>     2751          ret=  libvirtmod.virInterfaceDefineXML(self._o,  xml,  flags)
> -> 2752          if  retis  None:raise  libvirtError('virInterfaceDefineXML() failed',  conn=self)
>     2753          __tmp=  virInterface(self,  _obj=ret)
>     2754          return  __tmp
>
> libvirtError: this function is not supported by the connection driver: virInterfaceDefineXML
>

That's because you've libvirt compiled with udev rather than netcf. The 
netcf is the only one backend that knows how to create a new interface.

Install netcf and rebuild libvirt and you should be able to create 
interfaces via libvirt.

Michal